Skills.
Packaged know-how for Claude: install a skill once and every future session knows how to do the thing — the setup, the gotchas, the working starter code. Distilled from real builds in this lab.
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How to install a skill
Claude.ai / Claude apps
Download the .skill file, then upload it in a chat or in your Capabilities settings and choose Save skill. It becomes part of your profile — available in every conversation.
Claude Code
A .skill file is just a zip of the skill folder. Unzip it into ~/.claude/skills/ for every project, or commit it to a repo's .claude/skills/ to share it with everyone who works there.
After installing you rarely invoke a skill by name — Claude reads the description and reaches for it when your request matches. Skills are plain instructions and reference files; open the zip and read them.